Sometimes it is hard to isolate noises , it could be any number of things , including what you mentioned , but not limited to , cam bearings , just "normal" noise , the tensioner itself not working correctly , the list goes on .... , without hearing it , it is really hard to guide someone to the issue without knowing what they are hearing , and if it is something to worry about or not ...
Would it be possible for you to upload a video ??? , that way we might be able to help isolate the noise , or at least explain what it could be ....